package org.apache.maven.repository.metadata;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.ArtifactScopeEnum;

/**
 * metadata [dirty] Tree
 *
 * @author <a href="oleg@codehaus.org">Oleg Gusakov</a>
 *
 */
public class MetadataTreeNode {
  ArtifactMetadata md; // this node

  MetadataTreeNode parent; // papa

  /** default # of children. Used for tree creation optimization only */
  int nChildren = 8;

  MetadataTreeNode[] children; // of cause

  public int getNChildren() {
    return nChildren;
  }

  public void setNChildren(int children) {
    nChildren = children;
  }

  // ------------------------------------------------------------------------
  public MetadataTreeNode() {
  }

  // ------------------------------------------------------------------------
  public MetadataTreeNode(ArtifactMetadata md, MetadataTreeNode parent, boolean resolved, ArtifactScopeEnum scope) {
    if (md != null) {
      md.setArtifactScope(ArtifactScopeEnum.checkScope(scope));
      md.setResolved(resolved);
    }

    this.md = md;
    this.parent = parent;
  }

  // ------------------------------------------------------------------------
  public MetadataTreeNode(Artifact af, MetadataTreeNode parent, boolean resolved, ArtifactScopeEnum scope) {
    this(new ArtifactMetadata(af), parent, resolved, scope);
  }

  // ------------------------------------------------------------------------
  public void addChild(int index, MetadataTreeNode kid) {
    if (kid == null) {
      return;
    }

    if (children == null) {
      children = new MetadataTreeNode[nChildren];
    }

    children[index % nChildren] = kid;
  }

  // ------------------------------------------------------------------
  @Override
  public String toString() {
    return md == null ? "no metadata" : md.toString();
  }

  // ------------------------------------------------------------------
  public String graphHash() throws MetadataResolutionException {
    if (md == null) {
      throw new MetadataResolutionException(
          "treenode without metadata, parent: " + (parent == null ? "null" : parent.toString()));
    }

    return md.groupId + ":" + md.artifactId;
  }

  // ------------------------------------------------------------------------
  public boolean hasChildren() {
    return children != null;
  }

  // ------------------------------------------------------------------------
  public ArtifactMetadata getMd() {
    return md;
  }

  public void setMd(ArtifactMetadata md) {
    this.md = md;
  }

  public MetadataTreeNode getParent() {
    return parent;
  }

  public void setParent(MetadataTreeNode parent) {
    this.parent = parent;
  }

  public MetadataTreeNode[] getChildren() {
    return children;
  }

  public void setChildren(MetadataTreeNode[] children) {
    this.children = children;
  }
  // ------------------------------------------------------------------------
  // ------------------------------------------------------------------------

}
